From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
For background, see the previous commit introducing the library.
TODO:
* Make CI on gitgitgadget compile.
* Redo interaction between repo config, repo storage version
* Resolve the design problem with reflog expiry.
* Resolve spots marked with XXX
Example use:
$ ~/vc/git/git init --reftable
warning: templates not found in /usr/local/google/home/hanwen/share/git-core/templates
Initialized empty Git repository in /tmp/qz/.git/
$ echo q > a
$ ~/vc/git/git add a
$ ~/vc/git/git commit -mx
fatal: not a git repository (or any of the parent directories): .git
[master (root-commit) 373d969] x
1 file changed, 1 insertion(+)
create mode 100644 a
$ ~/vc/git/git show-ref
373d96972fca9b63595740bba3898a762778ba20 HEAD
373d96972fca9b63595740bba3898a762778ba20 refs/heads/master
$ ls -l .git/reftable/
total 12
-rw------- 1 hanwen primarygroup 126 Jan 23 20:08 000000000001-000000000001.ref
-rw------- 1 hanwen primarygroup 4277 Jan 23 20:08 000000000002-000000000002.ref
$ go run ~/vc/reftable/cmd/dump.go -table /tmp/qz/.git/reftable/000000000002-000000000002.ref
** DEBUG **
name /tmp/qz/.git/reftable/000000000002-000000000002.ref, sz 4209: 'r' reftable.readerOffsets{Present:true, Offset:0x0, IndexOffset:0x0}, 'o' reftable.readerOffsets{Present:false, Offset:0x0, IndexOffset:0x0} 'g' reftable.readerOffsets{Present:true, Offset:0x1000, IndexOffset:0x0}
** REFS **
reftable.RefRecord{RefName:"refs/heads/master", UpdateIndex:0x2, Value:[]uint8{0x37, 0x3d, 0x96, 0x97, 0x2f, 0xca, 0x9b, 0x63, 0x59, 0x57, 0x40, 0xbb, 0xa3, 0x89, 0x8a, 0x76, 0x27, 0x78, 0xba, 0x20}, TargetValue:[]uint8(nil), Target:""}
** LOGS **
reftable.LogRecord{RefName:"HEAD", UpdateIndex:0x2, New:[]uint8{0x37, 0x3d, 0x96, 0x97, 0x2f, 0xca, 0x9b, 0x63, 0x59, 0x57, 0x40, 0xbb, 0xa3, 0x89, 0x8a, 0x76, 0x27, 0x78, 0xba, 0x20}, Old:[]uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, Name:"Han-Wen Nienhuys", Email:"hanwen@xxxxxxxxxx", Time:0x5e29ef27, TZOffset:100, Message:"commit (initial): x\n"}
Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
Co-authored-by: Jeff King <peff@xxxxxxxx>
---
.../technical/repository-version.txt | 7 +
Makefile | 24 +-
builtin/clone.c | 4 +-
builtin/init-db.c | 55 +-
cache.h | 4 +-
refs.c | 20 +-
refs.h | 3 +
refs/refs-internal.h | 1 +
refs/reftable-backend.c | 880 ++++++++++++++++++
repository.c | 2 +
repository.h | 3 +
setup.c | 12 +-
12 files changed, 986 insertions(+), 29 deletions(-)
create mode 100644 refs/reftable-backend.c
diff --git a/Documentation/technical/repository-version.txt b/Documentation/technical/repository-version.txt
index 7844ef30ff..7257623583 100644
--- a/Documentation/technical/repository-version.txt
+++ b/Documentation/technical/repository-version.txt
@@ -100,3 +100,10 @@ If set, by default "git config" reads from both "config" and
multiple working directory mode, "config" file is shared while
"config.worktree" is per-working directory (i.e., it's in
GIT_COMMON_DIR/worktrees/<id>/config.worktree)
+
+==== `refStorage`
+
+Specifies the file format for the ref database. Values are `files`
+(for the traditional packed + loose ref format) and `reftable` for the
+binary reftable format. See https://github.com/google/reftable for
+more information.
diff --git a/Makefile b/Makefile
index 6134104ae6..706bb0a981 100644
--- a/Makefile
+++ b/Makefile
@@ -814,6 +814,7 @@ TEST_SHELL_PATH = $(SHELL_PATH)
LIB_FILE = libgit.a
XDIFF_LIB = xdiff/lib.a
VCSSVN_LIB = vcs-svn/lib.a
+REFTABLE_LIB = reftable/libreftable.a
GENERATED_H += command-list.h
@@ -959,6 +960,7 @@ LIB_OBJS += rebase-interactive.o
LIB_OBJS += reflog-walk.o
LIB_OBJS += refs.o
LIB_OBJS += refs/files-backend.o
+LIB_OBJS += refs/reftable-backend.o
LIB_OBJS += refs/iterator.o
LIB_OBJS += refs/packed-backend.o
LIB_OBJS += refs/ref-cache.o
@@ -1163,7 +1165,7 @@ THIRD_PARTY_SOURCES += compat/regex/%
THIRD_PARTY_SOURCES += sha1collisiondetection/%
THIRD_PARTY_SOURCES += sha1dc/%
-GITLIBS = common-main.o $(LIB_FILE) $(XDIFF_LIB)
+GITLIBS = common-main.o $(LIB_FILE) $(XDIFF_LIB) $(REFTABLE_LIB)
EXTLIBS =
GIT_USER_AGENT = git/$(GIT_VERSION)
@@ -2347,11 +2349,28 @@ VCSSVN_OBJS += vcs-svn/fast_export.o
VCSSVN_OBJS += vcs-svn/svndiff.o
VCSSVN_OBJS += vcs-svn/svndump.o
+REFTABLE_OBJS += reftable/basics.o
+REFTABLE_OBJS += reftable/block.o
+REFTABLE_OBJS += reftable/bytes.o
+REFTABLE_OBJS += reftable/file.o
+REFTABLE_OBJS += reftable/iter.o
+REFTABLE_OBJS += reftable/merged.o
+REFTABLE_OBJS += reftable/pq.o
+REFTABLE_OBJS += reftable/reader.o
+REFTABLE_OBJS += reftable/record.o
+REFTABLE_OBJS += reftable/slice.o
+REFTABLE_OBJS += reftable/stack.o
+REFTABLE_OBJS += reftable/tree.o
+REFTABLE_OBJS += reftable/writer.o
+REFTABLE_OBJS += reftable/zlib-compat.o
+
+
TEST_OBJS := $(patsubst %$X,%.o,$(TEST_PROGRAMS)) $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
OBJECTS := $(LIB_OBJS) $(BUILTIN_OBJS) $(PROGRAM_OBJS) $(TEST_OBJS) \
$(XDIFF_OBJS) \
$(VCSSVN_OBJS) \
$(FUZZ_OBJS) \
+ $(REFTABLE_OBJS) \
common-main.o \
git.o
ifndef NO_CURL
@@ -2488,6 +2507,9 @@ $(XDIFF_LIB): $(XDIFF_OBJS)
$(VCSSVN_LIB): $(VCSSVN_OBJS)
$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
+$(REFTABLE_LIB): $(REFTABLE_OBJS)
+ $(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
+
export DEFAULT_EDITOR DEFAULT_PAGER
Documentation/GIT-EXCLUDED-PROGRAMS: FORCE
diff --git a/builtin/clone.c b/builtin/clone.c
index 0fc89ae2b9..092485c883 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -1096,7 +1096,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
}
}
- init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
+ init_db(git_dir, real_git_dir, option_template,
+ DEFAULT_REF_STORAGE, /* XXX */
+ INIT_DB_QUIET);
if (real_git_dir)
git_dir = real_git_dir;
diff --git a/builtin/init-db.c b/builtin/init-db.c
index 45bdea0589..d51a99ed77 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -177,7 +177,8 @@ static int needs_work_tree_config(const char *git_dir, const char *work_tree)
}
static int create_default_files(const char *template_path,
- const char *original_git_dir)
+ const char *original_git_dir,
+ const char *ref_storage_format, int flags)
{
struct stat st1;
struct strbuf buf = STRBUF_INIT;
@@ -213,6 +214,7 @@ static int create_default_files(const char *template_path,
is_bare_repository_cfg = init_is_bare_repository;
if (init_shared_repository != -1)
set_shared_repository(init_shared_repository);
+ the_repository->ref_storage_format = xstrdup(ref_storage_format);
/*
* We would have created the above under user's umask -- under
@@ -222,6 +224,15 @@ static int create_default_files(const char *template_path,
adjust_shared_perm(get_git_dir());
}
+ /*
+ * Check to see if .git/HEAD exists; this must happen before
+ * initializing the ref db, because we want to see if there is an
+ * existing HEAD.
+ */
+ path = git_path_buf(&buf, "HEAD");
+ reinit = (!access(path, R_OK) ||
+ readlink(path, junk, sizeof(junk) - 1) != -1);
+
/*
* We need to create a "refs" dir in any case so that older
* versions of git can tell that this is a repository.
@@ -234,17 +245,21 @@ static int create_default_files(const char *template_path,
* Create the default symlink from ".git/HEAD" to the "master"
* branch, if it does not exist yet.
*/
- path = git_path_buf(&buf, "HEAD");
- reinit = (!access(path, R_OK)
- || readlink(path, junk, sizeof(junk)-1) != -1);
if (!reinit) {
if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
exit(1);
+ } else {
+ /*
+ * XXX should check whether our ref backend matches the
+ * original one; if not, either die() or convert
+ */
}
/* This forces creation of new config file */
- xsnprintf(repo_version_string, sizeof(repo_version_string),
- "%d", GIT_REPO_VERSION);
+ xsnprintf(repo_version_string, sizeof(repo_version_string), "%d",
+ !strcmp(ref_storage_format, "reftable") ?
+ GIT_REPO_VERSION_READ :
+ GIT_REPO_VERSION);
git_config_set("core.repositoryformatversion", repo_version_string);
/* Check filemode trustability */
@@ -339,7 +354,8 @@ static void separate_git_dir(const char *git_dir, const char *git_link)
}
int init_db(const char *git_dir, const char *real_git_dir,
- const char *template_dir, unsigned int flags)
+ const char *template_dir, const char *ref_storage_format,
+ unsigned int flags)
{
int reinit;
int exist_ok = flags & INIT_DB_EXIST_OK;
@@ -378,7 +394,8 @@ int init_db(const char *git_dir, const char *real_git_dir,
*/
check_repository_format();
- reinit = create_default_files(template_dir, original_git_dir);
+ reinit = create_default_files(template_dir, original_git_dir,
+ ref_storage_format, flags);
create_object_directory();
@@ -403,6 +420,8 @@ int init_db(const char *git_dir, const char *real_git_dir,
git_config_set("receive.denyNonFastforwards", "true");
}
+ git_config_set("extensions.refStorage", ref_storage_format);
+
if (!(flags & INIT_DB_QUIET)) {
int len = strlen(git_dir);
@@ -476,20 +495,24 @@ static const char *const init_db_usage[] = {
int cmd_init_db(int argc, const char **argv, const char *prefix)
{
const char *git_dir;
+ const char *ref_storage_format = DEFAULT_REF_STORAGE;
const char *real_git_dir = NULL;
const char *work_tree;
const char *template_dir = NULL;
unsigned int flags = 0;
const struct option init_db_options[] = {
- OPT_STRING(0, "template", &template_dir, N_("template-directory"),
- N_("directory from which templates will be used")),
+ OPT_STRING(0, "template", &template_dir,
+ N_("template-directory"),
+ N_("directory from which templates will be used")),
OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
- N_("create a bare repository"), 1),
+ N_("create a bare repository"), 1),
{ OPTION_CALLBACK, 0, "shared", &init_shared_repository,
- N_("permissions"),
- N_("specify that the git repository is to be shared amongst several users"),
- PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
+ N_("permissions"),
+ N_("specify that the git repository is to be shared amongst several users"),
+ PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0 },
OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
+ OPT_STRING(0, "ref-storage", &ref_storage_format, N_("backend"),
+ N_("the ref storage format to use")),
OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
N_("separate git dir from working tree")),
OPT_END()
@@ -591,9 +614,11 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
}
UNLEAK(real_git_dir);
+ UNLEAK(ref_storage_format);
UNLEAK(git_dir);
UNLEAK(work_tree);
flags |= INIT_DB_EXIST_OK;
- return init_db(git_dir, real_git_dir, template_dir, flags);
+ return init_db(git_dir, real_git_dir, template_dir, ref_storage_format,
+ flags);
}
diff --git a/cache.h b/cache.h
index cbfaead23a..781f929cb5 100644
--- a/cache.h
+++ b/cache.h
@@ -627,7 +627,8 @@ int path_inside_repo(const char *prefix, const char *path);
#define INIT_DB_EXIST_OK 0x0002
int init_db(const char *git_dir, const char *real_git_dir,
- const char *template_dir, unsigned int flags);
+ const char *template_dir, const char *ref_storage_format,
+ unsigned int flags);
void sanitize_stdfds(void);
int daemonize(void);
@@ -1041,6 +1042,7 @@ struct repository_format {
int is_bare;
int hash_algo;
char *work_tree;
+ char *ref_storage;
struct string_list unknown_extensions;
};
diff --git a/refs.c b/refs.c
index 1ab0bb54d3..6530219762 100644
--- a/refs.c
+++ b/refs.c
@@ -20,7 +20,7 @@
/*
* List of all available backends
*/
-static struct ref_storage_be *refs_backends = &refs_be_files;
+static struct ref_storage_be *refs_backends = &refs_be_reftable;
static struct ref_storage_be *find_ref_storage_backend(const char *name)
{
@@ -1836,13 +1836,13 @@ static struct ref_store *lookup_ref_store_map(struct hashmap *map,
* Create, record, and return a ref_store instance for the specified
* gitdir.
*/
-static struct ref_store *ref_store_init(const char *gitdir,
+static struct ref_store *ref_store_init(const char *gitdir, const char *be_name,
unsigned int flags)
{
- const char *be_name = "files";
- struct ref_storage_be *be = find_ref_storage_backend(be_name);
+ struct ref_storage_be *be;
struct ref_store *refs;
+ be = find_ref_storage_backend(be_name);
if (!be)
BUG("reference backend %s is unknown", be_name);
@@ -1858,7 +1858,10 @@ struct ref_store *get_main_ref_store(struct repository *r)
if (!r->gitdir)
BUG("attempting to get main_ref_store outside of repository");
- r->refs = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS);
+ r->refs = ref_store_init(r->gitdir,
+ r->ref_storage_format ? r->ref_storage_format :
+ DEFAULT_REF_STORAGE,
+ REF_STORE_ALL_CAPS);
return r->refs;
}
@@ -1913,7 +1916,7 @@ struct ref_store *get_submodule_ref_store(const char *submodule)
goto done;
/* assume that add_submodule_odb() has been called */
- refs = ref_store_init(submodule_sb.buf,
+ refs = ref_store_init(submodule_sb.buf, DEFAULT_REF_STORAGE, /* XXX */
REF_STORE_READ | REF_STORE_ODB);
register_ref_store_map(&submodule_ref_stores, "submodule",
refs, submodule);
@@ -1927,6 +1930,7 @@ struct ref_store *get_submodule_ref_store(const char *submodule)
struct ref_store *get_worktree_ref_store(const struct worktree *wt)
{
+ const char *format = DEFAULT_REF_STORAGE; /* XXX */
struct ref_store *refs;
const char *id;
@@ -1940,9 +1944,9 @@ struct ref_store *get_worktree_ref_store(const struct worktree *wt)
if (wt->id)
refs = ref_store_init(git_common_path("worktrees/%s", wt->id),
- REF_STORE_ALL_CAPS);
+ format, REF_STORE_ALL_CAPS);
else
- refs = ref_store_init(get_git_common_dir(),
+ refs = ref_store_init(get_git_common_dir(), format,
REF_STORE_ALL_CAPS);
if (refs)
diff --git a/refs.h b/refs.h
index 87c9ec921b..2b5985ad59 100644
--- a/refs.h
+++ b/refs.h
@@ -9,6 +9,9 @@ struct string_list;
struct string_list_item;
struct worktree;
+/* XXX where should this be? */
+#define DEFAULT_REF_STORAGE "files"
+
/*
* Resolve a reference, recursively following symbolic refererences.
*
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 1d7a485220..d87e9cbdec 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -661,6 +661,7 @@ struct ref_storage_be {
};
extern struct ref_storage_be refs_be_files;
+extern struct ref_storage_be refs_be_reftable;
extern struct ref_storage_be refs_be_packed;
/*
diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
new file mode 100644
index 0000000000..e793ee362e
--- /dev/null
+++ b/refs/reftable-backend.c
@@ -0,0 +1,880 @@
+#include "../cache.h"
+#include "../config.h"
+#include "../refs.h"
+#include "refs-internal.h"
+#include "../iterator.h"
+#include "../lockfile.h"
+#include "../chdir-notify.h"
+
+#include "../reftable/reftable.h"
+
+/*
+ The reftable v1 spec only supports 20-byte binary SHA1s. A new format version
+ will be needed to support SHA256.
+ */
+
+extern struct ref_storage_be refs_be_reftable;
+
+struct reftable_ref_store {
+ struct ref_store base;
+ unsigned int store_flags;
+
+ int err;
+ char *reftable_dir;
+ char *table_list_file;
+ struct stack *stack;
+};
+
+static void clear_log_record(struct log_record *log)
+{
+ log->old_hash = NULL;
+ log->new_hash = NULL;
+ log->message = NULL;
+ log->ref_name = NULL;
+ log_record_clear(log);
+}
+
+static void fill_log_record(struct log_record *log)
+{
+ const char *info = git_committer_info(0);
+ struct ident_split split = {};
+ int result = split_ident_line(&split, info, strlen(info));
+ int sign = 1;
+ assert(0 == result);
+
+ log_record_clear(log);
+ log->name =
+ xstrndup(split.name_begin, split.name_end - split.name_begin);
+ log->email =
+ xstrndup(split.mail_begin, split.mail_end - split.mail_begin);
+ log->time = atol(split.date_begin);
+ if (*split.tz_begin == '-') {
+ sign = -1;
+ split.tz_begin++;
+ }
+ if (*split.tz_begin == '+') {
+ sign = 1;
+ split.tz_begin++;
+ }
+
+ log->tz_offset = sign * atoi(split.tz_begin);
+}
+
+static struct ref_store *reftable_ref_store_create(const char *path,
+ unsigned int store_flags)
+{
+ struct reftable_ref_store *refs = xcalloc(1, sizeof(*refs));
+ struct ref_store *ref_store = (struct ref_store *)refs;
+ struct write_options cfg = {
+ .block_size = 4096,
+ };
+ struct strbuf sb = STRBUF_INIT;
+
+ base_ref_store_init(ref_store, &refs_be_reftable);
+ refs->store_flags = store_flags;
+
+ strbuf_addf(&sb, "%s/reftable", path);
+ refs->reftable_dir = xstrdup(sb.buf);
+ strbuf_reset(&sb);
+
+ strbuf_addf(&sb, "%s/reftable/tables.list", path);
+ refs->table_list_file = xstrdup(sb.buf);
+ strbuf_reset(&sb);
+
+ strbuf_addf(&sb, "%s/refs", path);
+ safe_create_dir(sb.buf, 1);
+ strbuf_reset(&sb);
+
+ strbuf_addf(&sb, "%s/HEAD", path);
+ write_file(sb.buf, "ref: refs/.invalid");
+ strbuf_reset(&sb);
+
+ strbuf_addf(&sb, "%s/refs/heads", path);
+ write_file(sb.buf, "this repository uses the reftable format");
+
+ refs->err = new_stack(&refs->stack, refs->reftable_dir,
+ refs->table_list_file, cfg);
+ strbuf_release(&sb);
+ return ref_store;
+}
+
+static int reftable_init_db(struct ref_store *ref_store, struct strbuf *err)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ FILE *file;
+ safe_create_dir(refs->reftable_dir, 1);
+
+ file = fopen(refs->table_list_file, "a");
+ if (file == NULL) {
+ return -1;
+ }
+ fclose(file);
+ return 0;
+}
+
+struct reftable_iterator {
+ struct ref_iterator base;
+ struct iterator iter;
+ struct ref_record ref;
+ struct object_id oid;
+ struct ref_store *ref_store;
+ unsigned int flags;
+ int err;
+ char *prefix;
+};
+
+static int reftable_ref_iterator_advance(struct ref_iterator *ref_iterator)
+{
+ struct reftable_iterator *ri = (struct reftable_iterator *)ref_iterator;
+ while (ri->err == 0) {
+ ri->err = iterator_next_ref(ri->iter, &ri->ref);
+ if (ri->err) {
+ break;
+ }
+
+ ri->base.refname = ri->ref.ref_name;
+ if (ri->prefix != NULL &&
+ strncmp(ri->prefix, ri->ref.ref_name, strlen(ri->prefix))) {
+ ri->err = 1;
+ break;
+ }
+ if (ri->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
+ ref_type(ri->base.refname) != REF_TYPE_PER_WORKTREE)
+ continue;
+
+ ri->base.flags = 0;
+ if (ri->ref.value != NULL) {
+ hashcpy(ri->oid.hash, ri->ref.value);
+ } else if (ri->ref.target != NULL) {
+ int out_flags = 0;
+ const char *resolved = refs_resolve_ref_unsafe(
+ ri->ref_store, ri->ref.ref_name,
+ RESOLVE_REF_READING, &ri->oid, &out_flags);
+ ri->base.flags = out_flags;
+ if (resolved == NULL &&
+ !(ri->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
+ (ri->base.flags & REF_ISBROKEN)) {
+ continue;
+ }
+ }
+
+ ri->base.oid = &ri->oid;
+ if (!(ri->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
+ !ref_resolves_to_object(ri->base.refname, ri->base.oid,
+ ri->base.flags)) {
+ continue;
+ }
+
+ break;
+ }
+
+ if (ri->err > 0) {
+ return ITER_DONE;
+ }
+ if (ri->err < 0) {
+ return ITER_ERROR;
+ }
+
+ return ITER_OK;
+}
+
+static int reftable_ref_iterator_peel(struct ref_iterator *ref_iterator,
+ struct object_id *peeled)
+{
+ struct reftable_iterator *ri = (struct reftable_iterator *)ref_iterator;
+ if (ri->ref.target_value != NULL) {
+ hashcpy(peeled->hash, ri->ref.target_value);
+ return 0;
+ }
+
+ return -1;
+}
+
+static int reftable_ref_iterator_abort(struct ref_iterator *ref_iterator)
+{
+ struct reftable_iterator *ri = (struct reftable_iterator *)ref_iterator;
+ ref_record_clear(&ri->ref);
+ iterator_destroy(&ri->iter);
+ return 0;
+}
+
+static struct ref_iterator_vtable reftable_ref_iterator_vtable = {
+ reftable_ref_iterator_advance, reftable_ref_iterator_peel,
+ reftable_ref_iterator_abort
+};
+
+static struct ref_iterator *
+reftable_ref_iterator_begin(struct ref_store *ref_store, const char *prefix,
+ unsigned int flags)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct reftable_iterator *ri = xcalloc(1, sizeof(*ri));
+ struct merged_table *mt = NULL;
+
+ mt = stack_merged_table(refs->stack);
+ ri->err = refs->err;
+ if (ri->err == 0) {
+ ri->err = merged_table_seek_ref(mt, &ri->iter, prefix);
+ }
+ base_ref_iterator_init(&ri->base, &reftable_ref_iterator_vtable, 1);
+ ri->base.oid = &ri->oid;
+ ri->flags = flags;
+ ri->ref_store = ref_store;
+ return &ri->base;
+}
+
+static int reftable_transaction_prepare(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ return 0;
+}
+
+static int reftable_transaction_abort(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ (void)refs;
+ return 0;
+}
+
+static int reftable_check_old_oid(struct ref_store *refs, const char *refname,
+ struct object_id *want_oid)
+{
+ struct object_id out_oid = {};
+ int out_flags = 0;
+ const char *resolved = refs_resolve_ref_unsafe(
+ refs, refname, RESOLVE_REF_READING, &out_oid, &out_flags);
+ if (is_null_oid(want_oid) != (resolved == NULL)) {
+ return LOCK_ERROR;
+ }
+
+ if (resolved != NULL && !oideq(&out_oid, want_oid)) {
+ return LOCK_ERROR;
+ }
+
+ return 0;
+}
+
+static int ref_update_cmp(const void *a, const void *b)
+{
+ return strcmp(((struct ref_update *)a)->refname,
+ ((struct ref_update *)b)->refname);
+}
+
+static int write_transaction_table(struct writer *writer, void *arg)
+{
+ struct ref_transaction *transaction = (struct ref_transaction *)arg;
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)transaction->ref_store;
+ uint64_t ts = stack_next_update_index(refs->stack);
+ int err = 0;
+ struct ref_update **sorted =
+ malloc(transaction->nr * sizeof(struct ref_update *));
+ COPY_ARRAY(sorted, transaction->updates, transaction->nr);
+ QSORT(sorted, transaction->nr, ref_update_cmp);
+ writer_set_limits(writer, ts, ts);
+
+ for (int i = 0; i < transaction->nr; i++) {
+ struct ref_update *u = sorted[i];
+ if (u->flags & REF_HAVE_OLD) {
+ err = reftable_check_old_oid(transaction->ref_store,
+ u->refname, &u->old_oid);
+ if (err < 0) {
+ goto exit;
+ }
+ }
+ }
+
+ for (int i = 0; i < transaction->nr; i++) {
+ struct ref_update *u = sorted[i];
+ if (u->flags & REF_HAVE_NEW) {
+ struct object_id out_oid = {};
+ int out_flags = 0;
+ /* Memory owned by refs_resolve_ref_unsafe, no need to
+ * free(). */
+ const char *resolved = refs_resolve_ref_unsafe(
+ transaction->ref_store, u->refname, 0, &out_oid,
+ &out_flags);
+ struct ref_record ref = {};
+ ref.ref_name =
+ (char *)(resolved ? resolved : u->refname);
+ ref.value = u->new_oid.hash;
+ ref.update_index = ts;
+ err = writer_add_ref(writer, &ref);
+ if (err < 0) {
+ goto exit;
+ }
+ }
+ }
+
+ for (int i = 0; i < transaction->nr; i++) {
+ struct ref_update *u = sorted[i];
+ struct log_record log = {};
+ fill_log_record(&log);
+
+ log.ref_name = (char *)u->refname;
+ log.old_hash = u->old_oid.hash;
+ log.new_hash = u->new_oid.hash;
+ log.update_index = ts;
+ log.message = u->msg;
+
+ err = writer_add_log(writer, &log);
+ clear_log_record(&log);
+ if (err < 0) {
+ return err;
+ }
+ }
+exit:
+ free(sorted);
+ return err;
+}
+
+static int reftable_transaction_commit(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *errmsg)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ int err = stack_add(refs->stack, &write_transaction_table, transaction);
+ if (err < 0) {
+ strbuf_addf(errmsg, "reftable: transaction failure %s",
+ error_str(err));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int reftable_transaction_finish(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ return reftable_transaction_commit(ref_store, transaction, err);
+}
+
+struct write_delete_refs_arg {
+ struct stack *stack;
+ struct string_list *refnames;
+ const char *logmsg;
+ unsigned int flags;
+};
+
+static int write_delete_refs_table(struct writer *writer, void *argv)
+{
+ struct write_delete_refs_arg *arg =
+ (struct write_delete_refs_arg *)argv;
+ uint64_t ts = stack_next_update_index(arg->stack);
+ int err = 0;
+
+ writer_set_limits(writer, ts, ts);
+ for (int i = 0; i < arg->refnames->nr; i++) {
+ struct ref_record ref = {
+ .ref_name = (char *)arg->refnames->items[i].string,
+ .update_index = ts,
+ };
+ err = writer_add_ref(writer, &ref);
+ if (err < 0) {
+ return err;
+ }
+ }
+
+ for (int i = 0; i < arg->refnames->nr; i++) {
+ struct log_record log = {};
+ struct ref_record current = {};
+ fill_log_record(&log);
+ log.message = xstrdup(arg->logmsg);
+ log.new_hash = NULL;
+ log.old_hash = NULL;
+ log.update_index = ts;
+ log.ref_name = (char *)arg->refnames->items[i].string;
+
+ if (stack_read_ref(arg->stack, log.ref_name, ¤t) == 0) {
+ log.old_hash = current.value;
+ }
+ err = writer_add_log(writer, &log);
+ log.old_hash = NULL;
+ ref_record_clear(¤t);
+
+ clear_log_record(&log);
+ if (err < 0) {
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int reftable_delete_refs(struct ref_store *ref_store, const char *msg,
+ struct string_list *refnames,
+ unsigned int flags)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct write_delete_refs_arg arg = {
+ .stack = refs->stack,
+ .refnames = refnames,
+ .logmsg = msg,
+ .flags = flags,
+ };
+ return stack_add(refs->stack, &write_delete_refs_table, &arg);
+}
+
+static int reftable_pack_refs(struct ref_store *ref_store, unsigned int flags)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ return stack_compact_all(refs->stack, NULL);
+}
+
+struct write_create_symref_arg {
+ struct reftable_ref_store *refs;
+ const char *refname;
+ const char *target;
+ const char *logmsg;
+};
+
+static int write_create_symref_table(struct writer *writer, void *arg)
+{
+ struct write_create_symref_arg *create =
+ (struct write_create_symref_arg *)arg;
+ uint64_t ts = stack_next_update_index(create->refs->stack);
+ int err = 0;
+
+ struct ref_record ref = {
+ .ref_name = (char *)create->refname,
+ .target = (char *)create->target,
+ .update_index = ts,
+ };
+ writer_set_limits(writer, ts, ts);
+ err = writer_add_ref(writer, &ref);
+ if (err < 0) {
+ return err;
+ }
+
+ {
+ struct log_record log = {};
+ struct object_id new_oid = {};
+ struct object_id old_oid = {};
+ struct ref_record current = {};
+ stack_read_ref(create->refs->stack, create->refname, ¤t);
+
+ fill_log_record(&log);
+ log.ref_name = current.ref_name;
+ if (refs_resolve_ref_unsafe(
+ (struct ref_store *)create->refs, create->refname,
+ RESOLVE_REF_READING, &old_oid, NULL) != NULL) {
+ log.old_hash = old_oid.hash;
+ }
+
+ if (refs_resolve_ref_unsafe((struct ref_store *)create->refs,
+ create->target, RESOLVE_REF_READING,
+ &new_oid, NULL) != NULL) {
+ log.new_hash = new_oid.hash;
+ }
+
+ if (log.old_hash != NULL || log.new_hash != NULL) {
+ writer_add_log(writer, &log);
+ }
+ log.ref_name = NULL;
+ log.old_hash = NULL;
+ log.new_hash = NULL;
+ clear_log_record(&log);
+ }
+ return 0;
+}
+
+static int reftable_create_symref(struct ref_store *ref_store,
+ const char *refname, const char *target,
+ const char *logmsg)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct write_create_symref_arg arg = { .refs = refs,
+ .refname = refname,
+ .target = target,
+ .logmsg = logmsg };
+ return stack_add(refs->stack, &write_create_symref_table, &arg);
+}
+
+struct write_rename_arg {
+ struct stack *stack;
+ const char *oldname;
+ const char *newname;
+ const char *logmsg;
+};
+
+static int write_rename_table(struct writer *writer, void *argv)
+{
+ struct write_rename_arg *arg = (struct write_rename_arg *)argv;
+ uint64_t ts = stack_next_update_index(arg->stack);
+ struct ref_record ref = {};
+ int err = stack_read_ref(arg->stack, arg->oldname, &ref);
+ if (err) {
+ goto exit;
+ }
+
+ /* XXX do ref renames overwrite the target? */
+ if (stack_read_ref(arg->stack, arg->newname, &ref) == 0) {
+ goto exit;
+ }
+
+ free(ref.ref_name);
+ ref.ref_name = strdup(arg->newname);
+ writer_set_limits(writer, ts, ts);
+ ref.update_index = ts;
+
+ {
+ struct ref_record todo[2] = {};
+ todo[0].ref_name = (char *)arg->oldname;
+ todo[0].update_index = ts;
+ /* leave todo[0] empty */
+ todo[1] = ref;
+ todo[1].update_index = ts;
+
+ err = writer_add_refs(writer, todo, 2);
+ if (err < 0) {
+ goto exit;
+ }
+ }
+
+ if (ref.value != NULL) {
+ struct log_record todo[2] = {};
+ fill_log_record(&todo[0]);
+ fill_log_record(&todo[1]);
+
+ todo[0].ref_name = (char *)arg->oldname;
+ todo[0].update_index = ts;
+ todo[0].message = (char *)arg->logmsg;
+ todo[0].old_hash = ref.value;
+ todo[0].new_hash = NULL;
+
+ todo[1].ref_name = (char *)arg->newname;
+ todo[1].update_index = ts;
+ todo[1].old_hash = NULL;
+ todo[1].new_hash = ref.value;
+ todo[1].message = (char *)arg->logmsg;
+
+ err = writer_add_logs(writer, todo, 2);
+
+ clear_log_record(&todo[0]);
+ clear_log_record(&todo[1]);
+
+ if (err < 0) {
+ goto exit;
+ }
+
+ } else {
+ /* XXX symrefs? */
+ }
+
+exit:
+ ref_record_clear(&ref);
+ return err;
+}
+
+static int reftable_rename_ref(struct ref_store *ref_store,
+ const char *oldrefname, const char *newrefname,
+ const char *logmsg)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct write_rename_arg arg = {
+ .stack = refs->stack,
+ .oldname = oldrefname,
+ .newname = newrefname,
+ .logmsg = logmsg,
+ };
+ return stack_add(refs->stack, &write_rename_table, &arg);
+}
+
+static int reftable_copy_ref(struct ref_store *ref_store,
+ const char *oldrefname, const char *newrefname,
+ const char *logmsg)
+{
+ BUG("reftable reference store does not support copying references");
+}
+
+struct reftable_reflog_ref_iterator {
+ struct ref_iterator base;
+ struct iterator iter;
+ struct log_record log;
+ struct object_id oid;
+ char *last_name;
+};
+
+static int
+reftable_reflog_ref_iterator_advance(struct ref_iterator *ref_iterator)
+{
+ struct reftable_reflog_ref_iterator *ri =
+ (struct reftable_reflog_ref_iterator *)ref_iterator;
+
+ while (1) {
+ int err = iterator_next_log(ri->iter, &ri->log);
+ if (err > 0) {
+ return ITER_DONE;
+ }
+ if (err < 0) {
+ return ITER_ERROR;
+ }
+
+ ri->base.refname = ri->log.ref_name;
+ if (ri->last_name != NULL &&
+ !strcmp(ri->log.ref_name, ri->last_name)) {
+ continue;
+ }
+
+ free(ri->last_name);
+ ri->last_name = xstrdup(ri->log.ref_name);
+ hashcpy(ri->oid.hash, ri->log.new_hash);
+ return ITER_OK;
+ }
+}
+
+static int reftable_reflog_ref_iterator_peel(struct ref_iterator *ref_iterator,
+ struct object_id *peeled)
+{
+ BUG("not supported.");
+ return -1;
+}
+
+static int reftable_reflog_ref_iterator_abort(struct ref_iterator *ref_iterator)
+{
+ struct reftable_reflog_ref_iterator *ri =
+ (struct reftable_reflog_ref_iterator *)ref_iterator;
+ log_record_clear(&ri->log);
+ iterator_destroy(&ri->iter);
+ return 0;
+}
+
+static struct ref_iterator_vtable reftable_reflog_ref_iterator_vtable = {
+ reftable_reflog_ref_iterator_advance, reftable_reflog_ref_iterator_peel,
+ reftable_reflog_ref_iterator_abort
+};
+
+static struct ref_iterator *
+reftable_reflog_iterator_begin(struct ref_store *ref_store)
+{
+ struct reftable_reflog_ref_iterator *ri = xcalloc(sizeof(*ri), 1);
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+
+ struct merged_table *mt = stack_merged_table(refs->stack);
+ int err = merged_table_seek_log(mt, &ri->iter, "");
+ if (err < 0) {
+ free(ri);
+ return NULL;
+ }
+
+ base_ref_iterator_init(&ri->base, &reftable_reflog_ref_iterator_vtable,
+ 1);
+ ri->base.oid = &ri->oid;
+
+ return empty_ref_iterator_begin();
+}
+
+static int
+reftable_for_each_reflog_ent_newest_first(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
+{
+ struct iterator it = {};
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct merged_table *mt = stack_merged_table(refs->stack);
+ int err = merged_table_seek_log(mt, &it, refname);
+ struct log_record log = {};
+
+ while (err == 0) {
+ err = iterator_next_log(it, &log);
+ if (err != 0) {
+ break;
+ }
+
+ if (strcmp(log.ref_name, refname)) {
+ break;
+ }
+
+ {
+ struct object_id old_oid = {};
+ struct object_id new_oid = {};
+ const char *full_committer = "";
+
+ hashcpy(old_oid.hash, log.old_hash);
+ hashcpy(new_oid.hash, log.new_hash);
+
+ full_committer = fmt_ident(log.name, log.email,
+ WANT_COMMITTER_IDENT,
+ /*date*/ NULL,
+ IDENT_NO_DATE);
+ if (fn(&old_oid, &new_oid, full_committer, log.time,
+ log.tz_offset, log.message, cb_data)) {
+ err = -1;
+ break;
+ }
+ }
+ }
+
+ log_record_clear(&log);
+ iterator_destroy(&it);
+ if (err > 0) {
+ err = 0;
+ }
+ return err;
+}
+
+static int
+reftable_for_each_reflog_ent_oldest_first(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
+{
+ struct iterator it = {};
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct merged_table *mt = stack_merged_table(refs->stack);
+ int err = merged_table_seek_log(mt, &it, refname);
+
+ struct log_record *logs = NULL;
+ int cap = 0;
+ int len = 0;
+
+ while (err == 0) {
+ struct log_record log = {};
+ err = iterator_next_log(it, &log);
+ if (err != 0) {
+ break;
+ }
+
+ if (strcmp(log.ref_name, refname)) {
+ break;
+ }
+
+ if (len == cap) {
+ cap = 2 * cap + 1;
+ logs = realloc(logs, cap * sizeof(*logs));
+ }
+
+ logs[len++] = log;
+ }
+
+ for (int i = len; i--;) {
+ struct log_record *log = &logs[i];
+ struct object_id old_oid = {};
+ struct object_id new_oid = {};
+ const char *full_committer = "";
+
+ hashcpy(old_oid.hash, log->old_hash);
+ hashcpy(new_oid.hash, log->new_hash);
+
+ full_committer = fmt_ident(log->name, log->email,
+ WANT_COMMITTER_IDENT, NULL,
+ IDENT_NO_DATE);
+ if (!fn(&old_oid, &new_oid, full_committer, log->time,
+ log->tz_offset, log->message, cb_data)) {
+ err = -1;
+ break;
+ }
+ }
+
+ for (int i = 0; i < len; i++) {
+ log_record_clear(&logs[i]);
+ }
+ free(logs);
+
+ iterator_destroy(&it);
+ if (err > 0) {
+ err = 0;
+ }
+ return err;
+}
+
+static int reftable_reflog_exists(struct ref_store *ref_store,
+ const char *refname)
+{
+ /* always exists. */
+ return 1;
+}
+
+static int reftable_create_reflog(struct ref_store *ref_store,
+ const char *refname, int force_create,
+ struct strbuf *err)
+{
+ return 0;
+}
+
+static int reftable_delete_reflog(struct ref_store *ref_store,
+ const char *refname)
+{
+ return 0;
+}
+
+static int reftable_reflog_expire(struct ref_store *ref_store,
+ const char *refname,
+ const struct object_id *oid,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ BUG("per ref reflog expiry is not implemented for reftable backend.");
+ /*
+ TODO: should iterate over the reflog, and write tombstones. The
+ tombstones will be removed on compaction.
+ */
+}
+
+static int reftable_read_raw_ref(struct ref_store *ref_store,
+ const char *refname, struct object_id *oid,
+ struct strbuf *referent, unsigned int *type)
+{
+ struct reftable_ref_store *refs =
+ (struct reftable_ref_store *)ref_store;
+ struct ref_record ref = {};
+ int err = stack_read_ref(refs->stack, refname, &ref);
+ if (err) {
+ goto exit;
+ }
+ if (ref.target != NULL) {
+ /* XXX recurse? */
+ strbuf_reset(referent);
+ strbuf_addstr(referent, ref.target);
+ *type |= REF_ISSYMREF;
+ } else {
+ hashcpy(oid->hash, ref.value);
+ }
+exit:
+ ref_record_clear(&ref);
+ return err;
+}
+
+struct ref_storage_be refs_be_reftable = {
+ &refs_be_files,
+ "reftable",
+ reftable_ref_store_create,
+ reftable_init_db,
+ reftable_transaction_prepare,
+ reftable_transaction_finish,
+ reftable_transaction_abort,
+ reftable_transaction_commit,
+
+ reftable_pack_refs,
+ reftable_create_symref,
+ reftable_delete_refs,
+ reftable_rename_ref,
+ reftable_copy_ref,
+
+ reftable_ref_iterator_begin,
+ reftable_read_raw_ref,
+
+ reftable_reflog_iterator_begin,
+ reftable_for_each_reflog_ent_newest_first,
+ reftable_for_each_reflog_ent_oldest_first,
+ reftable_reflog_exists,
+ reftable_create_reflog,
+ reftable_delete_reflog,
+ reftable_reflog_expire
+};
diff --git a/repository.c b/repository.c
index a4174ddb06..ff0988dac8 100644
--- a/repository.c
+++ b/repository.c
@@ -174,6 +174,8 @@ int repo_init(struct repository *repo,
if (worktree)
repo_set_worktree(repo, worktree);
+ repo->ref_storage_format = xstrdup_or_null(format.ref_storage);
+
clear_repository_format(&format);
return 0;
diff --git a/repository.h b/repository.h
index 040057dea6..198d4aa090 100644
--- a/repository.h
+++ b/repository.h
@@ -70,6 +70,9 @@ struct repository {
/* The store in which the refs are held. */
struct ref_store *refs;
+ /* The format to use for the ref database. */
+ char *ref_storage_format;
+
/*
* Contains path to often used file names.
*/
diff --git a/setup.c b/setup.c
index e2a479a64f..e2e1583eee 100644
--- a/setup.c
+++ b/setup.c
@@ -440,9 +440,11 @@ static int check_repo_format(const char *var, const char *value, void *vdata)
if (!value)
return config_error_nonbool(var);
data->partial_clone = xstrdup(value);
- } else if (!strcmp(ext, "worktreeconfig"))
+ } else if (!strcmp(ext, "worktreeconfig")) {
data->worktree_config = git_config_bool(var, value);
- else
+ } else if (!strcmp(ext, "refstorage")) {
+ data->ref_storage = xstrdup(value);
+ } else
string_list_append(&data->unknown_extensions, ext);
}
@@ -531,6 +533,7 @@ void clear_repository_format(struct repository_format *format)
string_list_clear(&format->unknown_extensions, 0);
free(format->work_tree);
free(format->partial_clone);
+ free(format->ref_storage);
init_repository_format(format);
}
@@ -1173,8 +1176,11 @@ const char *setup_git_directory_gently(int *nongit_ok)
gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
setup_git_env(gitdir);
}
- if (startup_info->have_repository)
+ if (startup_info->have_repository) {
repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
+ the_repository->ref_storage_format =
+ xstrdup_or_null(repo_fmt.ref_storage);
+ }
}
strbuf_release(&dir);
--
gitgitgadget
